Panasonic PC-NLF04S WhisperLine Accessory Kit, 4-Inch Single Pick Up Accessory vent kit for WhisperLine series Includes: 4-Inch single inlet grille, back draft damper, clamp, and zip ties Compatible with FV-10NLF1 WhisperLine 120 CFM In-Line Fan and FV-NLF04G WhisperLine 4-Inch Duct Inlet Grille Grille pattern: slotted with beveled edge and white finish Single inlet